>
> I've just had a horrible thought:  What powers heart pacemakers?


One would hope that anything that went into a pacemaker would be top
quality, and thoroughly tested.

Gargoyle tells us true:
http://www.apexbattery.com/mdi-2000-pacemaker-battery-sealed-lead-acid-batteries-mdi-batteries.html

Lithium Iodine Cells apparently are the real thing.
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